在热连轧中轧制条件对工作辊性能的影响设计外文文献翻译中英文翻译外文翻译.docx
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在热连轧中轧制条件对工作辊性能的影响设计外文文献翻译中英文翻译外文翻译.docx
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在热连轧中轧制条件对工作辊性能的影响设计外文文献翻译中英文翻译外文翻译
外文原文:
Rollingconditionsinhotstripmillsandtheirinfluenceontheperformanceofworkrolls
Summary.Themechanicalrollingconditionsinhotstripmillsarepreciselydefinedbyvariables,whicharetakendirectlyfromtherollingscheduleseperationforce,torque,speed,stripthickness)orcalculatedfromfiguresoftherollingscheduleanddimensionsofthemill(stripreduction,rolldiameteretc).Thesevariablesallowtodescriblethemechanicalrollingconditionsofallpassesinroughingandfinishingmills.Thesevariablesshouldbesupplementedbythemetallurgicalrollingconditions.Theythengivebasicinformationontheconditionswhichdeterminewear(specificload,wearspeed)andfirecrazing(co-efficientofheatpenetrationetc).
Thereisagoodchancetousetheexperiencesofothermillswithvariousrollgradesbyanalogcomparison-aslongastherollingconditionsaresimilar.Thismethodislimitedby“abnormalrollingconditions”,whichrequiretotallydifferentrollgrades,althoughifitwouldbemuchbettertoeliminatetheabnormalconditions.
Introduction.inhotstripmills,slabsof150to250mmthickarerolledtostrip1.5to12mmthick.Conventionalhotstripmillsconsistofroughingandfinishingstands.Theconfigurationoftheroughingmillsvarieswidely.Amillwithonereversingstandandoneortwocontinuousroughingstandsiscalleda%conditionsmillandamillwith4to6conditionsroughingstandsiscalledacontinuousmill.
In3/4continuousandcontinuousmills,thefirststandsareusuallytwohighstandswhiletheremainderare4highstands.Inadditiontothesehorizontalstands,severaledgersarealsoused.Thefinishingmillshaveaminimumof4standsbutnormallyhave6to7stands.
Rollingconditionsvaryfrommilltomill,standtostandandpasstopass.Millconfigurationsaredesignedforadesiredtotalstip(thickness)reduction,however,eachstandislimitedinstripreductionbythemaximumseparationforce,maximumtorque,riskofslippageetc.
Inordertosupplythecorrectrollforeachmill,rollmakersaskfordetailsoftherollingconditionsandanyspecialcircumstances.However,howtousethisinformation?
HowtocomparetheconditionsofpassNo.XandNo.X+?
?
?
Therehavemanydiscussionsovertheyearsbutrarelyanyreallygoodresultswiththesecomparisons.
Forexample,lookingatroughingmillworkrolls,therearesomanyrollgradesbeingusedindifferentmillsthatitisevidentthattheoptimumgradetoyieldthemaximumqualityforallapplicationshasnotyetbeenfound.
Todate,notheorieshavebeenproved.Infact,inmanyinstancesthecombinationofexperienceandrollperformanceinthemillsistotallycontrarytothetheoriesofyesterdayandtoday.
Eventhefinesttheorydoesnothelpifarollgradefails:
→“Banding”inroughingstandsnevercreatedproblems,butthehandingprobleminfinishingmillshasnotbeensolvedbyanyrollgrade.Andthereislittlehopeforchangeinfuture.
→Thereisnotsingleoutstandingqualityforroughingmillswhichout-performsallotherqualitiesineveryapplication.Thisisbecauserollingconditionsvarywidely.
Inthispaperanattemptismadetoidentifysomevariableswhichareindependentonthemillandthepassesintheymill,andthentoanalysetile“rollingconditions”.Thebasesfortheseanalyticalstudiesareactualrollingschedulesforsimilarstripdimensionsandqualitiesfromdifferentmillsandexperiencewithdifferentrollgradesinthesemills.Wehavetoidentifythedifferentvariablesforeverystandandeverypassandthentrytofindtherelationshipbetweenthesevariablesandtheperformancefigurefordifferentrollgrades.Allinformationaboutspecialpracticesinthemillsforproducinggoodstripprofileandflatstrip,whichareofhighimportanceformillpeople,arenotconsideredbecausetheyprobablyhavenoinfluenceonthechoiceofthecorrectrollgrade.Theinitialideawastoanswerallquestions,tosolveallproblemsbyhavingrulesforrollwearandfirecrazing.Weveryquicklyfoundthatthiswasimpossible.Evenwiththemostsophisticatedmethods,becausewecanonlystudy“normalrollingconditions”andeveryoftenthesocalled“abnormalconditions”areeverydayoccurrences.Andonlythesimplefiguresfromtherollingschedulesareavailableandnoactualinformationonloads.torqueortherealtemperaturedistributiononstripandrolls,nothingaboutchangeofthetotalrollingprogram(length,coffinshape….)
Thereforewewilltrytodefinetherulesfornormalconditionsandtheotherproblem,toeliminatethe“abnormalconditions”,isuptothemillpeople.Wehavetoprovehowgoodourvariablesforrollingconditionsareandhowtheyareaffectedbytile“abnormalconditions”.
Rollingconditionsandtheoreticalbackground.Therollingconditionsaredirectlyrelatedtotileconfigurationoftile
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